docs(native-filters): Remove outdated statement

[john-bodley]

SUMMARY

This PR removes a statement which is no longer accurate. The cleanup phase of the native dashboard filter migration only deletes the filter boxes associated with the identified dashboards.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

CI.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #24873 (9573b55) into master (bf1b1a4) will increase coverage by 0.00%.
Report is 1 commits behind head on master.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #24873   +/-   ##
=======================================
  Coverage   69.00%   69.00%           
=======================================
  Files        1906     1906           
  Lines       74139    74139           
  Branches     8209     8209           
=======================================
+ Hits        51156    51159    +3     
+ Misses      20862    20859    -3     
  Partials     2121     2121           

Flag	Coverage Δ
hive	54.13% <ø> (ø)
javascript	55.84% <ø> (+<0.01%)	⬆️
mysql	79.22% <ø> (ø)
postgres	79.32% <ø> (ø)
presto	54.03% <ø> (ø)
python	83.37% <ø> (ø)
sqlite	77.89% <ø> (ø)
unit	55.00% <ø> (ø)

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see 1 file with indirect coverage changes

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[sfirke]

I'm unfamiliar with this command group so if there's any doubt there it should get another perspective - but it seems clear-cut.